1. What kinds of lens materials are there?
Natural materials: crystal stone, high hardness, not easy to grind, can transmit ultraviolet rays, and has birefringence.
Artificial materials: including inorganic glass, organic glass and optical resin.
Inorganic glass: It is smelted from silica, calcium, aluminum, sodium, potassium, etc., with good transparency.
Plexiglass: The chemical composition is polymethyl methacrylate.
Optical resin: The chemical composition is propylene diethylene glycol carbonate. The advantages are light weight, impact resistance, casting molding, and easy dyeing.
2. What are the advantages and disadvantages of resin lenses?
Advantages: light weight, not fragile, no edges or corners when broken, safe
Disadvantages: non-wearable lenses are thicker and the price is slightly higher
3. What is the bifocal lens?
The same lens has two luminosity, the upper light is the far area, and the lower light is the near area.
4. What are the characteristics of multifocal lenses?
A pair of glasses can see far, middle and short distances, seamless, beautiful, for young people to control myopia, middle-aged and elderly patients with presbyopia can make life more convenient.
5. What is the hardened lens?
Hardening, as the name suggests, means that the lens is harder than ordinary lenses. Hardened lenses have super wear resistance. The principle is that the surface of the lens is plated with special ultra-fine particles hardening treatment to enhance the wear resistance of the lens and prolong the service life. .
Post time: Oct-26-2021